Use basic concepts to determine antenna noise temperature

Details Use basic concepts to determine antenna noise temperature Use basic concepts to determine antenna noise temperature

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991micwa..30..107b&link_type=abstract

Microwaves & RF (ISSN 0745-2993), vol. 30, March 1991, p. 107, 108, 110 (3 ff.).

Physics

Antenna Radiation Patterns, Atmospheric Attenuation, Black Body Radiation, Noise Temperature, Fokker-Planck Equation, Galactic Radiation, Low Noise, Solar Radiation

Scientific paper

Practical formulas for calculating the noise temperature of an RF antenna are derived, starting from the Raleigh-Jeans approximation to Planck's law for a blackbody source. The estimation of noise from sources such as the Galaxy, the sun, the earth, atmospheric absorption, antenna resistive loss, and lightning strikes is discussed in detail and illustrated with diagrams. It is pointed out that noise temperature is not a direct function of antenna gain, except when increased gain acts to focus the beam on a hot spot in the sky.

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